Gearing.



H. C. SPAULDING.

V (BEARING.

APPLICATIQN FILED MAY H3. 1912. I Patented June 20, 1916.

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era/mime. APPLICATION FILED MAY 16, 1912.

Patented June 20, 1916.

2 SHEETSSHEET 2- HOLLON C. SPAULDING, 0F COLEBROOK, CONNECTICUT.

enemies.

Specification of Letters Patent.

Patented June admin.

Application filed May 16, 1912. Serial No. 697,683.

To all whom it may concern:

Be it known that I, HOLLON 0. Sum.- DING, a citizen of the United States, residing at Colebrook, county of Litchfield, and State of Connecticut, have invented certain new and useful Improvements in Gearing, of which the following is a full, clear, and exact description.

My invention relates to hoisting apparatus and has special reference to that class of hoists which are operated by hand power and are employed for lifting heavy articles.

In the development of hand hoisting apparatus the most satisfactory device so far produced is the spur geared chain block, with a planetary or balanced gear train.- In this class of apparatus it is necessary to make the initial pinion smaller than is desirable or else sacrifice compactness and head room to obtain the necessary strength.

In my invention, instead of driving the initial pinion of the planetary gear train direct from the hand wheel chain sheave, I interpose a differential between them. This reduces the speed of the pinion 50% at the outset, allowing the pinion to be made larger with practically no increase of size of the hoist. A greater gear reduction is also possible with this device.

In my invention the load sheave is suspended direct from the hook yoke by suspension pieces in such a way that the supporting mechanism may be allowed to revolve around a common center with the load ed sheave. This allows the interposition of a spring or buffer to take up the shock of the sudden load, and contact pieces may be used to close an electric circuit or in some way give notice that the hoist is loaded to its capacity. Also a simple indicating means may be used which is dependent upon the angular rotation and will give the Weight of the load.

Other features of my invention are the use of the cam detent instead of the pawl and ratchet for sustaining the load. This makes the device noiseless and also prevents the weight from dropping part way as is the case when a ratchet is used.-

Other features are the improved chain guide which fairs the chain onto the sheave, and the fibrous friction disk.

I have fully and clearly illustrated a preferred form of my invention in the accompanying drawings to be taken as a part of this specification and wherein,

Figure 1 shows a sectional view of the de- V106. Fig. 2 shows a detail view of the clutch mechanism. Fig. 3 shows. a detail.

having its periphery grooved as shown at 16- to receive the links of a chain. The hub 17 of this hand wheel sheave is provided with a worm thread 18 which screws over the threads 14 of the worm hub 12. Fastened upon the end of the shaft 10, by the cap bolt is a cap plate 19. This ca plate prevents the worm 17 of the hen wheel driving sheave from coming completely off the hub 12. The plate 19 is however at a short distance from the end of the worm 12 so that a slight unscrewing of the hand wheel may take place before the hub 17 contacts with the plate 12. The purpose of this will be explained later.

Revolubly mounted on the hub 17 is a sleeve 58. This sleeve has two arms 59 and 60 which are extended to the periphery of the hand wheel sheave. Here they are bent in substantially U-shape (see Fig. 5). The U-shape portion of the arms carries studs 62 on which grooved idler wheels 63 are rotatably mounted. These idler wheels are facing and adjacent the grooves and pockets in the periphery of the handwheel sheave so that not only will the position of the arms automatically accord with the angle of pull in the plane of the hand wheel, but the arm guide wheels 63 being complementary in shape to the grooves in the hand wheel, the chain will be automatically alined and faired in feeding into the latter with a minimum of friction. Suitable stops, not shown, are placed on the frame-limiting the extreme movement of the-chain arm guides.

The clutch devices consist of the friction plate 21, mounted on the shaft 10, but not fastened thereto. This plate has inserted in it the friction plugs 22 (see Fig. 2). These may be of any fibrous material, such as cork. The periphery of this plate 21 is notched, forming cam spaces, as shown in 23', Fig. 2. These cam spaces slope gradually from the periphery and terminate in an abrupt shoulder 24. In the rear of the friction plate 21'-and upon the shaft 10 is a disk 25. This disk extends outwardly and has at its periphery a projecting mm 26 which extends over the periphery of the plate 21. I

In the cam spaces 23, between the projecting rim 26 and the plate 21 are placed rollers or balls 27. Springs may be provided, bearing upon the shoulder 24 and the balls or rollers but these are not essential to the operation of the device.

Revolubly mounted upon the shaft 10 is the main load sheave,29. This sheave has d its periphery formed to engage the links of a chain which has at its end the usual lifting hook. Upon each end of the load sheave are the two load sheave bushings 30. These -bushings are formed with a. slot 31 adapted to receive the straps 32 and 33.. 'These straps extend upwardly and are fastened to the-upper hook yoke 34. The hook 35 is fastened inany suitable manner to this yoke 34.

The sleeve 25 has projecting from it two I stops 64 and 65 (see Fig. 3). Thesestops contact with the stop 64, thus closing an electric circuit and notifying the operator by a suitable alarm device that the maximum load is upon the hoist. In lieu of the electrical alarm system a pointer may be attached to the strap 32, this pointer 68, moving over a calibrated scale 69 on the sleeve 25, and so showing the approximate load on the hoist.

Fastened to the straps 32 and 33 at the points 37 and 38, respectively, is a load chain guide 39. This guide 39 is grooved to receive the upper part of the load chain and serves asa guide for the chain as well as a brace. for thetwo straps 32 and 33.

The shaft 10" is made larger in diameter at the part where it extends through the load sheave 29. This serves to form shoulders on the shaft 10. The shoulder 40 serves as an abutment for the sleeve 25.

I Fastenedto the extreme right of the shaft by' means of a 'key is a bevel gear 41. Mounted upon the main load sheave 29 adjacent the load bushings 30 is a frame 42. This frame 42 is fastened to the in their orbit with the spider frame 46.

The spider frame 46 has an extended hub .49 whlch has cut init the spur gear teeth 50.

On 'an extension of the main driving sheave 29 is keyed a cage 51. This cage carries the studs 52, which carry upon them pinions 54 and 55. These pmions are" of slightly difierent diameter. The pinions 54 and 55 are fastened together or are made in one piece as desired. Upon a proje'ctin rim 56 of the frame 42 is cut an interna gear 57. The teeth of this gear mesh with the teeth of the pinion55'and'the teeth of the pinions 54 mesh with the teeth-50 of the hub 49. It is therefore seen that the pinion 50 and the gears 54 and 55 together with the internal gear'formed on the rim 56 of .the frame 42 complete the elements of a sun and planet gearing train. 50 is the sun gear and 54 and 55 the planetary gears.

Theoperation of the device is as follows :-Upon' a clockwise pull of the hand chain the driving sheave runs up the worm 14 until it contacts with the friction plugs 22 in the plate 21. The plate and driving sheave then rotate as one. Further movement transversely is prevented by the sleeve 25 abutting against the shoulders 40 of the shaft. The hand wheel driving sheave, the worm hub 14 and the shaft 10 then rotate as one. The shaft 10 rotates the bevel gear 41 and by means of the differential action of the parts 41, 42 and 46 a reduction of 50% is obtained. In other words, the frame 46 rotates at one half the speed of the bevel gear .41.

The power is transmitted from the sun gear 50 to the two planetary gears 54 and 55. 54 meshing with the teethon the internal gear is prevented from idly rotating and is caused to travel around the shaft 10 and the sun gear 50 in a planetary manner. The

gear traveling in this manner carries the stud 52 with it. The stud being rigidly attached to the main load sheave 29 rotates the sheave. Thus it is seen that there is a filst reduction in the differential gearing, a second reduction between the sun gear and the planetary gear and a third reduction between the planetary gear and the internal gear. Thus it is seen that a greater gear reduction may be obtained with little or no increase in the size of the hoist. The actual ratio of speed to hoisting speed is dependent upon the roportions t the'gears.

1 @nreleasing the and chain, the load of course tends-to turnthe' disk 21 in the opposite direction, but the balls or rollsin the cam spaces in its periphery immediately engage with the rim of the sleeve 26to pre-v vent all but the most incipient rotation, which owing to the plurality of balls or rollers is practically nil.

To lower the load the hand chain is pulled in a counterclockwise direction. This counterclockwise movement of the driving sheave tends to run it 'ofi the worm 14, and release the friction between 15 and the friction plate 21, upon which the weight of the load acting through the gear train immediately causes a corresponding rotation in the shaft 10, which therefore overhauls 15,

vand again restores equilibrium through the gearsrevoluble on said spider, bevel gears at'each side of the aforesaid idler gears and meshing therewith, said bevel gears, spider and idler gearing comprising a di'derential gear train whereby speed is reduced, gear teeth on the hub portion of thesaid idler forming a sun ear and planetary gears 10- cated between t e aforesaid bevel gears and below said bevel'idler gears, said planetary e re at in it tent y ob Wnehin lit-il gears cooperating with the aforesaid sun gear and teeth on one of the aforesaid bevel 'ars whereby speed is further reduced.

I 2. A gear train for hoisting devices, comprising, 1n combination, bevel gears oneof said gears having internal gear teeth thereon, a spider, idler gears carried by the spider, said bevel gears, s ider and idlers cooperating to form a di' erential gearing to nal gear teeth thereon forming a sun gear and planetary "gears coiiperating with the sun gear and the internal gear teeth on the bevel. gear, whereby a further reduction in speed .is obtained. p

p 3. ll-lifla'device of the clas's described, in combination, a difi'erential gearing comprising a stationary gear, having internal gear teeth thereon, a spider having idlers thereon and co'dperatin'g with the stationary gear, a second gear in mesh with the said idlers, a planetary gearing comprising planet gears meshing with the internal gear teeth on the aforesaid stationary gear, a spider carrying said planet gears and connected with the member to be driven, a second set of planet gears carried by the said spider and rotating in unison with vthe first mentioned set of planet gears, and a sun gear driving the second jmentioned planet gears, said sun gear being secured to the spider carrying the idlers for the differential gearing.

In testimony whereof I afiix my signature in the presence of two subscribing witnesses.

HOLLON C. SPAULDING.

ed tor five centr each, by addressing the tommitaioner 0t lPatenta,

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reduce speed; the said spider-having exter- 

